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The Home Depot worker who murdered his manager before killing himself was simmering with anger after being dumped by his girlfriend — and being passed over for a promotion by the man he killed, law enforcement sources told The Post on Monday.

Within the last week, Calvin Esdaile was reprimanded by a supervisor at the Chelsea hardware store for “being rude” to manager Moctar Sy, whom he fatally shot Sunday in Aisle 12, sources said.

The gunman had a beef with Sy, after Sy got a supervisory position at the store over him, Sy’s sister said.

“He wanted the managerial position, and he was not happy that my brother got the position,” Kadidia Traore said.

Calvin Esdaile

“My brother is not violent. He’s not confrontational. I don’t understand.”

Esdaile’s grieving dad last saw his son, along with the killer’s 6-year-old son, two weeks ago, when they visited him at his St. Albans home.

Esdaile, 31, seemed happy at the time and had talked about buying a car and moving to Georgia to be with his girlfriend, Nichola Prince, 23, the dad said.

But that never happened.

Esdaile had put in for a transfer to a Georgia Home Depot — but canceled it, saying his girlfriend was moving back to New York, the sources said.

Instead, Prince dumped him. On Sunday, he snapped.

“The only one that knows what happened is him. He never told us nothing,” said Calvin Esdaile Sr.

The younger Esdaile, of Brooklyn, had worked a shift on Sunday but left — returning to the store with a .38-caliber pistol to gun down Sy, 38, before turning the gun on himself.

Esdaile hadn’t been fired, although his dad told The Post he had been.

Prince is currently in Jamaica, according to her brother Darrin Prince, and couldn’t be reached for comment.

The store, at West 23rd Street and Sixth Avenue, was closed on Monday.

One of Esdaile’s former colleagues said working there must have pushed him over the edge.

“He worked hard, had good morals. But working here must have drove him crazy,” said Lorenzo, who declined to give his last name. “Many of us didn’t like that job — we left.”